Fakhirah Ahmad, Yushinta Fujaya, Dody Dharmawan Trijuno, and Siti Aslamyah. 2015. Acceleration of Blue Swimming Crab (Portunus pelagicus) Larval Development by Phytoecdysteroid. Aquacultura Indonesiana, 16 (2): 50-55. Phytoecdysteroid is a mimic of hormone-like molt regulating hormone in arthropoda and crustacea. The aim of this research was to investigate the response of blue swimming crab (Portunus pelagicus) larvae on various doses /100 g artificial diet) were used in this research. Larval development and survival rate were measured. The results showed that the larvae development rate increased of vitomolt enrichment in predigested artificial diet. Four doses of vitomolt (0; 4; 40; 400 mg in congruent with the dose of vitomolt. However, highest survival rate was found on 4 mg vitomolt/100 g artificial diet (P>0.05). Based on regression analysis, it is estimated the optimal dose of vitomolt for larval development rate and survival rate was about 23 mg/100 g of artificial diet. Vitomolt application in artificial diet could be used to accelerate the larval development rate in blue swimming crab.

The purpose of this study was to evaluate various types of fermentor for dry matter digestibility (DMD), organic matter digestibility (OMD), and the chemical composition of fermented seaweed. Five types of seaweed were used as substrates included green strain of Kappaphycus alvarezii, brown strain of K. alvarezii, Gracilaria gigas, Sargassum sp., and Caulerpa sp. The treatments were four fermentors, namely Bacillus sp. 2 mL/100 g of seaweed flour; 1.5% of tape yeast as a source of Rhizopus sp.; 1.5% of baker's yeast as a source of Saccharomyces sp.; a mix of Bacillus sp., tape yeast of Rhizopus sp. and baker's yeast of Saccharomyces sp. with compositions of 1 mL+1 g+1 g/100 g of seaweed flour; and control treatment. The results showed an increase in the percentage of DMD (21.94-27.76%) and OMD (8.35-11.66%) of all seaweed fermented using fermentor compared to control (DMD of 17.65-20.36% and OMD of 4.36-5.98%). Moreover, the highest result was obtained by the fermentor mix (DMD of 24.86-27.76% and OMD of 10.02-11.66%). Similar result was also found in the chemical composition of fermented seaweed, there was increase in protein content of 9.23-15.93% and nitrogen free extract (NFE) of 56.05-70.26% in each seaweed treated with fermentation using fermentors, compared to controls (protein of 8.82-11.54% and NFE of 52.26-65.72%). Furthermore, the highest value was shown by seaweed fermented with mixed fermentors (protein of 9.92-15.93% and NFE of 58.47-70.26%). Yet, the opposite result was present in the ash, crude fiber, and fat content of seaweed fermented using fermentors of which the lowest value was found in treatment of mixed fermentor.Keywords: fermentation, fermentor, seaweed, quality, feed ingredients ABSTRAK Tujuan penelitian ini adalah mengevaluasi berbagai jenis fermentor terhadap kecernaan bahan kering (KBK), kecernaan bahan organik (KBO), dan komposisi kimia rumput laut terfermentasi. Lima jenis rumput laut digunakan sebagai substrat, yaitu Kappaphycus alvarezii strain hijau, K. alvarezii strain coklat, Gracillaria gigas, Sargasum sp., dan Caulerva sp. Perlakuan yang diuji empat fermentor, yaitu Bacillus sp. 2 mL/100 g tepung rumput laut; 1,5% ragi tape sebagai sumber Rhizopus sp.; 1,5% ragi roti sebagai sumber Saccharomyces sp.; campuran Bacillus sp., ragi tape Rhizopus sp., dan ragi roti Saccharomyces sp. dengan komposisi 1 mL+1 g+1 g/100 g tepung rumput laut; serta kontrol. Hasil penelitian menunjukkan terjadi peningkatan persentase KBK (21,94-27,76%) dan KBO (8,35-11,66%) semua jenis rumput laut difermentasi dengan fermentor dibandingkan kontrol (KBK 17,36, dan KBO 4,98%) dan yang tertinggi dengan fermentor campuran (KBK 24,76 dan KBO 10,(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)66%). Begitu juga yang terjadi pada komposisi kimia rumput laut difermentasi, terjadi peningkatan kadar protein (9,23-15,93%) dan bahan ekstrak tanpa nitrogen/BETN (56,05-70,26%) pada setiap rumput laut yang diberi perlakuan fermentasi menggunakan fermentor, dibandingkan kontrol (protein 8,82-11,54% dan BETN 52,26-65,72%), y...

This study aims to determine the level of carbohydrate and feeding frequency on the growth and the carbohydrate digestibility of juvenile shrimp vanamei. This study used a factorial design patterns completely randomized design with two factors and three replications of each factor given time. The treatments tested were factor A (carbohydrate feeding different levels, namely 26, 32, 38, and 44%) and factor B (feeding frequency 2 times, 4 times, and 6 times per day). Shrimp juvenile were used have an average individual weight of 0.3 g. Feeding dose is 10% of the body weight and the feeding frequency adapted to the treatment. The results showed that combination treatment with carbohydrate levels by 38% and the feeding frequency 4 times a day are the best combination of treatments to the specific growth rate and digestibility of carbohydrates juvenile white shrimp.

Copra meal is an alternative protein source as fish meal in fish feed because the nutritional value is almost the same. However, copra meal has a relatively high crude fiber content, so efforts are needed to reduce crude fiber content through the fermentation process using the microbe Rizopus sp. which produces cellulase enzymes. This study aims to determine the digestibility level of fermented copra meal in feed as a source of vegetable protein in the maintenance of saline tilapia (Oreochromis niloticus) seeds. The research were conducted with the addition of fermented, dried and powdered copra meal to the feed with a concentration of: (A) 0%; (B) 15%; (C) 30% and (D) 45%. The fish were given test feed on a daily basis with a feeding frequency of once per day. The results showed that giving 15% of the fermented copra meal as plant protein source in the feed gave a better total feed digestibility compared to the addition of unfermented copra meal.

Vannamei shrimp production in Indonesia has experienced a rapid development in the last decade. One of the main problems in the cultivation of vannamei shrimp in ponds is the high use of artificial feed. This study aimed to examine the combination of feed dose and feeding frequency on the growth and survival rate of vannamei shrimp farmed in ponds. Vannamei shrimp juveniles were kept in square floating net cages (1 m x 1 m x 1.5 m) called hapa suspended in the ponds. The feed formulation used corn flour substituted with 50% sweet potato flour as a carbohydrate source. The research used a factorial Completely Randomised Design (CRD). The first factor was the feed dose (3%, 6% and 9% of shrimp bodyweight) and the second factor was the feeding frequency (3, 4 and 5 times per day). There were 3 replicates of each combination of treatments giving a total of 27 experimental units. The experiment lasted 8 weeks. The results showed a significant influence of treatment applied on the growth and survival of juvenile vannamei shrimp. The highest daily growth rate of shrimp was 3.98% obtained with the 3% feed dose treatment combined with the feeding frequency of 4 times per day. The highest survival rate of vannamei shrimp was 80%, obtained with a combination of 3% feed dose and feeding frequencies of 3 and 4 times per day.